Note that the lever starting right of center & weraing-in to the left is not universal. This seems to be most prominent on American guns but any number of British & Europen guns were not built with this feature. The lever started centered & stayed that way. On many of the cheaper guns the bolting surface were fairly rough machined & initial wearing in came pretty fast. Beyond that I highly suspect more of the wear came from friction in simply opening & closing the gun with un-lubricated surfaces.
